<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:api="https://api.shippingmanager.pl/">
   <soapenv:Header/>
   <soapenv:Body>
      <api:GetAvailableCarriers>
         <!--Optional:-->
         <api:token>
            <!--Optional:-->
            <api:UserName>demo@demo.pl</api:UserName>
            <!--Optional:-->
            <api:Password>demo</api:Password>
         </api:token>
      </api:GetAvailableCarriers>
   </soapenv:Body>
</soapenv:Envelope>